निम्नलिखित में से कौन सा एक गैर-प्रक्षेपित (non-projected), दृश्य, त्रि-आयामी (three-dimensional) शिक्षण अधिगम सामग्री (TLM) का उदाहरण है?

Prolonged occupational exposure to excessive noise from heavy machinery without hearing protection causes noise-induced hearing loss. Excess noise is categorized as a:

Long-term exposure to indoor air pollutants, such as smoke from burning biomass fuels, significantly increases the risk of developing chronic respiratory conditions like: